Size: 9mm. These photos really highlight the brown pigmentation of the wing venation (Venation: The pattern in which the veins on the wings of an insect are arranged. It is usually one of the most useful identifying characteristics.), but in the hand the wings look to be a uniform smokey gray. - Entoman

This mayfly was collected from the Fall River on October 22nd, 2011 and added to Troutnut.com on February 4th, 2012.